Recommended upgrade path?

I have a system at home running Kubuntu 10.10 (maverick) running Trinity before it was actually Trinity (3.5.12 - packages are all *-kde3). What is the best way to update this to a more modern version of Ubuntu, say 12.04 LTS?

Same question for my work system, but it's at 11.04/Natty Narwhal with Trinity 3.5.13.

My days as a Solaris admin tell me (scream at me) "don't do an upgrade, do a fresh install!", but I think I'd rather not.

-- Peter Laws / N5UWY National Weather Center / Network Operations Center University of Oklahoma Information Technology plaws@ou.edu (Remote) College of Architecture, Regional and City Planning, MRCP '16